#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<vector>
class Solution 
{
public:
    vector<vector<int>> generate(int numRows)
    {
        vector<vector<int>> vv(numRows);
        for (size_t i = 0;i < numRows;i++)
        {
            vv[i].resize(i + 1, 0);
            vv[i].front() = vv[i].back() = 1;
        }
        for (size_t i = 0;i < numRows;i++)
        {
            for (size_t j = 0;j < vv[i].size();j++)
            {
                if (vv[i][j] == 0)
                {
                    vv[i][j] = vv[i - 1][j - 1] + vv[i - 1][j];
                }
            }
        }
        return vv;
    }
};
